When working with sheet metal, the word “gauge” is often used. For example, if you don’t know how the gauge system works, it might not be clear what 18 gauge steel means. As a resource, this blog has a sheet metal gauge chart and a description of the gauge system.

How are Sheet Metal Gauges Used?

Gauges are used to measure the thickness of a piece of sheet metal. The values of gauges don’t depend on either the metric system or the standard system for measuring. Using a gauge conversion chart, you can figure out how thick a piece of sheet metal really is in inches or millimeters. A gauge conversion chart shows that 18 gauge steel is the same as 0.0478 inches or 1.214 millimeters. The number “18” on the gauge has nothing to do with the lengths themselves.

There are many different gauge systems in use today, and each type of metal has its own gauge number. Under one gauge system, the thickness of 18 gauge steel is 0.0478 inches, while the thickness of 18 gauge aluminum is 0.0403. Due to the different thicknesses, a gauge chart should be used to make sure the metal is the right size.

History of the Gauge System

The gauge system has been used for a long time in metalworking. Before the standard and metric measurement systems were widely used, it probably came from the British wire business. Gauges were used to measure the size of the metal wire being pulled at the time. Since then, it has been a common way to show the thickness of wire and metal sheets.

Sheet Metal Gauge Charts

Use these sheet metal gauge charts to determine the metal gauge you require:

Jump to:

Mild Steel Gauge Chart

Aluminum Gauge Chart

Stainless Steel Gauge Chart

Galvanized Steel Gauge Chart

Brass Gauge Chart

Copper Gauge Chart

Mild Steel Gauge Chart*
GaugeNumberInchesMM
7.17934.554
8.16444.175
9.14953.797
10.13453.416
11.11963.038
12.10462.656
14.07471.897
16.05981.518
18.04781.214
20.0359.911
22.0299.759
24.0239.607
26.0179.454
28.0149.378
Buy Mild Steel
Aluminum Gauge Chart*
GaugeNumberInchesMM
7.14433.665
8.12853.264
9.11442.906
10.10192.588
11.090742.305
12.080812.053
14.064081.628
16.050821.291
18.040301.024
20.03196.812
22.02535.644
24.02010.511
26.01594.405
28.01264.321
30.01003.255
Buy Aluminum
Stainless Steel Gauge Chart*
GaugeNumberInchesMM
8.171874.365
9.156253.968
10.140623.571
11.1253.175
12.109372.778
14.078121.984
16.06251.587
18.0501.270
20.0375.9525
22.03125.7937
24.025.635
26.01875.476
28.01562.396
30.0125.3175
Buy Stainless Steel
Galvanized Steel Gauge Chart*
GaugeNumberInchesMM
8.16814.269
9.15323.891
10.13823.510
11.12333.1318
12.10842.753
14.07851.9939
16.06351.6129
18.05161.310
20.03961.005
22.0336.853
24.0276.701
26.0217.551
28.0187.474
30.0157.398
Buy Galvanized Steel
Brass Gauge Chart*
GaugeNumberInchesMM
7.14433.665
8.12853.264
9.11442.906
10.10192.588
11.090742.305
12.080812.053
14.064081.628
16.050821.291
18.040301.024
20.03196.812
22.02535.644
24.02010.511
26.01594.405
28.01264.321
30.01003.255
Buy Brass
Copper Gauge Chart*  
GaugeNumberInchesMM
7.1804.572
8.1654.191
9.1483.759
10.1343.404
11.1203.048
12.1092.769
14.0832.108
16.0651.651
18.0491.245
20.035.889
22.028.711
24.022.559
26.018.457
28.014.356
30.012.305
Buy Copper

Read More :

Difference Between Mild Steel Channels and Mild Steel Flat Bars – Mild steel channels, also known as rolled steel channels, are C-shaped beams that have good structural properties and are inexpensive, Mild steel flat bars are made of low carbon steel that is easy to weld, cut, and machine.

ISMC (Indian Standard Medium Channel) Weight Chart: Channels made of mild steel are U-shaped steel constructions, and their dimensions and wall thickness are typically employed to define them. The bottom flange and the top web are the two components that make up a channel manufactured out of mild steel.

Call Now ButtonCALL NOW